linux-kernel - Re: [RFC] Initial alpha-0 for new page allocator API

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Message-ID: <Pine.LNX.4.64.0609220934040.7083@schroedinger.engr.sgi.com>
Date:	Fri, 22 Sep 2006 09:35:13 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Andi Kleen <ak@...e.de>
cc:	Martin Bligh <mbligh@...igh.org>, akpm@...gle.com,
	linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	James Bottomley <James.Bottomley@...eleye.com>,
	linux-mm@...ck.org
Subject: Re: [RFC] Initial alpha-0 for new page allocator API

On Fri, 22 Sep 2006, Andi Kleen wrote:

> On Friday 22 September 2006 06:02, Christoph Lameter wrote:
> > We have repeatedly discussed the problems of devices having varying 
> > address range requirements for doing DMA.
> 
> We already have such an API. dma_alloc_coherent(). Device drivers
> are not supposed to mess with GFP_DMA* directly anymore for quite
> some time. 

Device drivers need to be able to indicate ranges of addresses that may be 
different from ZONE_DMA. This is an attempt to come up with a future 
scheme that does no longer rely on device drivers referring to zoies.

> > We would like for the device  
> > drivers to have the ability to specify exactly which address range is 
> > allowed. 
> 
> I actually have my doubts it is a good idea to add that now. The devices
> with weird requirements are steadily going away

Hmm.... Martin?

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